I realize the inherent need to make the symbol look exactly like a tree. I would like to propose subtle imagery that stays true to the tree symbolism while exploring other things.
My idea is inspired from a few concepts. 1) Tree rings = growth potential. 2) Orbital paths / planets - service revolves around you. 3) Tree crown with yellowish golden fruit (rewards). I think the icon would make a nice placeholder on the iphone and on a car window etc.